grid.hh
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	#ifndef GRID_HH
	#define GRID_HH

	/* -------------------------------------------------------------------------- */
	#include <vector>
	/* -------------------------------------------------------------------------- */

	class Grid {
	public:
	Grid(int m, int n);

	/// access the value [i][j] of the grid
	inline float & operator()(int i, int j) { return m_storage[i * m_n + j]; }
	inline const float & operator()(int i, int j) const {
	return m_storage[i * m_n + j];
	}

	/// set the grid to 0
	void clear();

	int m() const;
	int n() const;

	private:
	int m_m, m_n;
	std::vector<float> m_storage;
	};

	#endif /* GRID_HH */